Note: Descriptions are shown in the official language in which they were submitted.
2 ~ 7 3
SPECIFICATION
1. Title of the Invention
OPTICAL DATA STORAGE CARD
2. Backaround of the Invention
1) Field of the Invention
The present invention relates to an optical data
storage card used for recording and storage of informa-
tion.
2) Description of the Related Art
Optical data storage cards obtained by adhering a
recording layer, that is, an optical abso.rption layer
onto a substrate and further laminating other layers have
been disclo~ed in Japanese Laid-Open Patent 138382
(lg90), 130737 (1990), 122438 (1990) and 118917 (1990).
Alkylphthalocyanine which constitutes the record-
ing layer disclosed in Japanese Laid-Open Patent 138382
(1990~ could not provide sensitivity re~uired for the
optical data storage cards. The optical data storage
cards described in the examples of Japane3e Laid-Open
Publication 130737 (1990) were poor in sensitivity and
durability and could not satisfy requirement that the
cards had reflectanee of 30% or more in the absorption
wavelength ranging from 780 to 830 mn.
~3~3
-- 2 --
Japanese Laid-Open Patent 122438 (1990) disclosed
an optical data storage card having the same constitution
of la~ers as khe present invention. However, the re-
flectance of the disclosed card was lower than the re-
quired level of 30%, and durability of the card was also
unsatisfactory.
3. Summary of the Invention
The ob~ect of the present invention is to provide
an op~ical data storage card having reflectance of 30% or
more which has not been obtained by the above convention-
al cards, and being excellent in sensitivity and durabil-
ity.
A8 a re~ult of an intensive investigation in
order to ac~ompli~h the above object, the present inven-
tors have found that, when a near in~rared absorber
contained in the recording layer of the optical data
storage card has a melting point of from 150 to 300 C and
a decomposition initiating temperature of from 200 to
350 C, the optical data storage card comprised of the
recording layer containing the near infrared absorber is
excellent in sensitivity for writing signals and symmetry
of written signals and also has small distortion in
recording.
They have also found that the optical data stor-
age card can maintain a reflectance of 30% or more in a
23~3~73
maximum absorption wavelength ranging from 770 to 840 nm
by using in the recording layer a near infrared absorber
having a maximum wavelength of rom 730 to 790 nm in a
chloroform solution.
The present inventors have also found that par-
ticularly the melting point and the decomposition initi-
ating temperature have great contribution to the sensi-
tivity in recording and stability in reseneration, and
completed the invention on the basis of the discovery.
The optical data ~torage card of the invention
has a laminated constitution in the order: a transparent
substrate, the recording layer and a protecti~e layer.
The recording l~yer is characterized by containing the
near infrared absorber composed of a compound or a mix-
ture of the same having a melting point in the range of
150 to 300 C and a decomposition initiating temperature
in the rang2 of 200 to 350 C.
The melting point was mea~ured with a common
melting point tester. The decomposition initiating
temperature was measured with a differential thermal-
thermogravimetric simul~aneous analyzer (DTA-TGA). The
temperature of 5% decomposition was defined as the decom-
position initiating temperature.
4. Detailed Description of the Preferred Embodiments
The optical data storage card, that is, a rectan-
2 ~ 3 9 bJ 7 3
gular recording medium which is used for an ID card andis composed of the substrate, recording layer and the
protective layer is subjected to recording and regenera-
tion with a semiconductor laser having a wavelength of
from 780 to 830 nm. Hence, the recording layer prefera-
bly comprises a near infrared absorber having Amax in
the range of from 7~0 to 790 nm in a chloroform solution.
A near infrared absorber having a maximum molar e~tinc-
tion coefficient (&max) of 1 x 10S 1 mol-l cm- or more
is particularly preferred in view of sensitivity and
regeneration. The ratio of reflecting light to the
reading out light from the substrate side (reflectance)
becomes 30 to 50~ and both regeneration performance and
writing sensitivity are improved.
The substrate for use in the optical data storage
card of the present invention is an optically transparent
resin. Exemplary resin used for the substrate includes
acrylic resin, polyethylene resin, polyvinyl chloride
resin, polyvinylidene chloride resin, polycarbonate
resin, ethylene resin, olefine copolymer resin, vinyl
chloride copolym~r resin, vinylidene chloride copolymer
resin and styrene copolymer resin. The substrate may be
surface treated with a thermosetting resin or an ultravi-
olet curing resin.
The near infrared absorbers which can be con-
tained in the recording layer include, for example,
: phthalocyanine compounds and isomers of the same which
are represented by the formula tI):
R2 R3
R,~N--Mot--
N <,N~f N
RI~R9
,0
`
~herein each of Rl, R2, R3, R4, R5, R6, R7, R8, R9 Rl
Rl~, Rl2, Rl3, Rl4, Rl5, and Rl6 are indi~idually a
hydrogen atom, halogen atom, nitro, substituted or unsub-
stituted alkyl, substituted or unsubstituted aryl, sub- :
stituted or unsubstituted alkoxy, substituted or unsub-
,
stituted aryloxy, substituted or unsubstituted alkylthio,
or substituted or unsubstituted arylthio group; wherein,
in a combination of Rl and R4, R~ and R8, R9 and Rl 2 ~ and
Rl3 and R16 ~ at least one group is selected from a sub-
stituted or unsubstituted alkoxy, substituted or unsub-
stituted aryloxy, substituted or unsubstituted alkylthio,
and substituted or unsubstituted arylthio group; in Rl,
~2~ R3, R~, R5, R6, R7, R8, R9, Rl, Rll, Rl2, Rl3, Rl4
,
7 ~
R7 5 and Rl6, from 1 to 4 groups are halogen atoms; and
Met is two hydrogen atoms, a divalent metal atom, or a
trivalent or te~ravalent metal derivative; and also
include cyanine colorants, anthraquinone colorants,
polyolefine colorants and thiapyrylium colorants. The
optical data storage card having excellent recording
sensitivity and recording properties can be obtained by
selecting from these substance~ a colorant or a mixture
of the same having a melting point of from 150 to 300 C
and a decomposition initiating temperature of from 200 to
350 C.
The recording layer can be prepared by coating or
vapor-depositing the above single compound or a mixture
of the same into one or two layers. In a coating method,
20% by weight or less, preferably 0% by weiyht of a
binder resin and from O.OS to 20% by weight, preferably
from O.S to 20~ by weight of the above compound are
dissolved in a solvent~ and the resulting solution is
coated with a spin coater. Vapor dsposition method is
carried out by depositing the above compound on the
substrate under 10-5 to 10-' torr at 100 to 300 C.
The thickness of the recording layer containiny
the near infrared absorber is preferably from 50 to 300
The solvent which can be used for the spin coat-
ing depends upon the sol~ent resistance of the substrate.
7 ~
Preferred solvents include, for example, halogenated
hydrocarbons such as dichloromethane, chloroform, carbon
tetrachloride, tetrachloroethylene and dichlorodifluoro-
ethane; ethers such as diethyl ether, dipropyl ether and
dibutyl ether; alcohols such as methanol, ethanol and
propanol; cellosolves such as methyl cellosolve and ethyl
cellosolve; and hydrocarbons such as hexane, cyclohexane,
octane, benzene and toluene.
After preparing the recording layer on the sub-
strate as mentioned above, an ultraviolet curing resin
composition or a thermosetting resin composition is
coated by a spin coating method, bax coater method or a
dipping method and cured to obtain a protective layer.
~he thickness of the protective layer i8 preferably from
1 to 500 ~m.
Preparation of the optical data storage card is
preferably carried out by using polyacrylate or polycar-
bonate as a substrate and applying with a spin coating
method in view of cost and easiness in handling by cus-
tomers.
The present invention will hereinafter be illus-
trated in detail by way of examples. Howe~er, these
examples are not to be construed to limit ths scope of
the invention.
Part in the examples means part by weight.
2 ~
Example 1
PhS SPh C
~H3 ~=~ H3
CH3CH2CH2CH- O ~ O- CHCH2CH2CH3
CH3 / \ CH3
CH3CH2CH2CH- O N--~N~N 0- CHCH2CH2CH3
I~R~N--CU--N~SPh (Ph = ~)
CH3CH2CH2CH - O N ~,N~,N O- CHCH2CH2CH3
~H3 ~ CH3
CH3CH2CH2CH- C) ~0- CHCH2CH2CH3
CH3 PhS SPh CH3
One part of the phthalocyanine illustrated by the
formula and ha~ing a melting point of 250-C or more,
decomposition initiation temperature of 302-C, Amax of
776 nm and ~max of 1.8 x 105 1 mol-l cm-1 was dissol~ed
in 100 parts of dibutyl ether and coated on a polycarbon-
ate substrata of an optical data storage card. A photo-
~etting ty:pe polyacrylate resin was top-coated and cured
by photo irradiation.
The optical data storage card obtained had a C/N
ratio of 60 dB at a linear velocity of 1.4 m/sec and a
laser power of 7 mW at 830 nm and thus sensitivity was
good.
No deterioration of the recording layer was
observed after irradiating in a fade meter at 63 C for
100 hours.
~3~7~
Example 2
(CH3) 2CHCH2CH - O ~0 - CHCH2CH ( CH3) 2
CH3 ~ CH3
(CH3) 2CHCH2~H - O N--~N~N 0- CHCH2CH ( CH3) 2
l~N--VO--N~
Cl~ ~CI
(CH3) 2CHCH2CH- O N ~,N~N O- CHCH2CH ( CH3) 2
(!:H3 ~ CH3
(CH3)2CHCH2CH - 0~0- (~HCH2CH ( CH3) 2
CH3 Cl Cl ~H3
Five parts of the phthalocyanine illu~trated by
the above formula and having a melting point of 150 C,
decomposition initiating temperature of 305 C, lmax of
770 nm and 6 max of 2.0 x 105 1 mol-l cm-l were dissolved
in 500 part~ by n-octane and coated with a spin coater on
a polycarbonate substrate for an optical data storage
card 50 as to give a dry film thickness of 15a nm. An
ultraviolet curing resin was coated on the film and cured
by irradiating ultraviolet light to form a protective
layer. The optical data storage card thus obtained had a
reflectance of 35~ and could be written a record having a
C/N ratio of 60 dB at a linear velocity of 1.4 m/sec with
a laser of 7 mW in power and 830 nm in wavelength. No
change was found on the card after irradiation with a
carbon arc lamp at 63'C for 200 hours.
-- 10 --
Example 3
H C PhS SPh C H
sl2 )=< l2 s
C4HsCHCH2- 0 ~ /~ O~ CH2CHC4Hs
HsCI2 ~ f~2Hs
C4HsCHCH2~ 0 N--~N/~N 0- CH2CHC4Hs
~N--Pd--N~SPh (Ph= ~)
PhS J~ ~ SPh
C4Hs(~HCH2- N ~N~7,~N O- CH2CHC4Hs
HsC2 ~ C2Hs
C4HsCHCH2~ 0~ ~0~ CH2CHC4Hs
HsC2 PhS SPh z s
Five part~ of palladium 1,4,5,8,9,12,13,16- i
octa(2-ethylhexyls~xyJ-2,3,6/7,10,11,14,15-octa-
(phenylthio)phthalocyanine illus~rated by the formula and
having a melting point of 250 ~C or above, a decomposi-
tion initiating temperature of 252 C, Amax of 775 nm
and 6 max of 1.7 x 105 1 mol-l cm-l were dissolved in n-
hexane and coated with a spin coater on a polycarbonate
sub~trate to a film thic~ness of 120 nm~ A protective
layer was formed on the coated film by using ultraviolet
curing resin.
The optical data storage card obtained was re-
corded at a linear veloci~y of 1.3 m/sec with a laser of
7 mW in power and 780 nm in wavelength to obtain record
having a C/N ratio of 55 dB. No change was observed
after irradiating the card with a xenon lamp at 50 C for
200 hours.
2 '~ 3 9 ~ 7 ~ ;
Example 4
PhS SPh CH ( C
~=~ CH2 H3) 2
C4H3~ O - CHCH (CH3)2
(CH3)2CHCH ~
(CH3)2CHCH- o N--~N~N o- C4Hg
~N--N i--N~ (Ph = ~)
C4H9- 0 N <~N>~ O- CHCH (CH3)2
(CH3)2CHCH- ~o_ C4Hg CH2CH ( CH3) 2
(CH3)2C~ICH PhS SPh
Five parts of phthalocyanine illustrated by the
formula and having a melting point of 250 C or above, a
decomposition initiating temperature of 350 C, lmax of
778 nm and ~max of 1.6 x 105 1 mol-~ cm-~ were dissolved
in 300 part~ of a 3:1 mixture of dibutyl ether and diiso-
propyl ether and coated on a PMMA substrate with a spin
coater to a thicknesR of 120 nm. A protective layer was
successively formed with an ultraviolet curing resin.
The optical data storage card thus obtained was
recorded at a linear velocity of 1.4 m/sec with a laser
of 8 mW in power and 830 nm in wavelength. A record
having a C~ ratio of 60 dB was obtained.
P~ ~
- 12 -
Example S
C4H9C6H4S SC6H4C4Hg
(CH3) 2CHCH2CHZ~ CH2CH2CH ( CH3) z
C4H9C6H4 ( CH3) 2CI ICH2CH2 N N CH2CH2CH ( CH3) 2
C4HgC6H4S ~N--CU--N~ SC6H4C4Hg
C4HgC6H4S ~ )~ SC6H4C4Hg
(CH3)2CHCH2CH2-0 Ny~N~_N 0-CH2CH2CH (CH3)2
(CH3~ 2CHCH2CH2--~0- CH2CH2CH ( CH3) 2
C4HgC6H~S SC6H4C4Hg
An optical data s~orage card was prepared by
carrying out the same procedures as described in Example
1 except that phthalocyanine illustrated hy the formula
and having a melting point of 152-C, decomposition initi-
ating temperature of 298 C, Amax of 773 nm and emax of
1.7 x 105 l mol-l cm-l was used.
The optical data storage card thus obt~ined was
recorded at a linear velocity of 1.4 m/sec with a laser
of 7 mW in power and 830 nm in wavelength to obtain a
record having a C/N ratio of 60 dB.
As to regeneration stability,no change was ob-
served on the signals after reading out 100,000 times
with a semiconductor laser having l mW in power and 830
nm in wavelength.
2 q~ 3 ~
Example 6
~0- CH [ CH (CH3)2]2
[(CH3)2CH~2CH-O N N N
~N--VO--N~
N ~,N~N O - CH ~ CH (CH3) 2
[ (CH3~ 2CH] 2CH- 0~
An optical data storage card was prepared by
carrying out the same procedures as described in Example
1 except that phthalocyanine illustrated by the formula
and having a melting point of 185 to 250 C, deco~position
initiating temperature of 218-C, Amax of 734 nm and &max
of 2.0 x 10S 1 mol-l cm-l was used.
The optical data storage card thus obtained waæ
recorded at a linear velocity of 1.4 m/sec with a laser
of 8 mW in power and 830 nm in wavelength to obtain a
record having a C/N ratio of 60 dB.
As to regeneration stabili~y, no change was
observed on the signals after reading out 108,000 times
with a semiconductor laser having 1 mW in power and 830
nm in wavelength.
` ;
- 14
~xample 7
8r
_~O-CH [CH(CH3)2]2
[(CH3)2CH]2CH-O N N N
~N--VO--N~
Ny~N>~N O-CH [CH(CH3)2]2
[(CH3)2CH]2CH- 0
: Br
An optical data storage card was prapared by
carrying out the same procedures as described in Example
1 except that phthalocyanine illustrated by the formula
and having a melting point of 200 to 235 C, decomposition
initiating temperature of 206 C, lmax of 750 nm and ~max
of 1.9 x 105 l mol-l cm-l was used.
The optical data storage card thus obtained was
recorded at a linear velocity of 1.3 m/sec with a laser
of 7 m~ in power and 330 nm in wavelength to obtain a
record having a C/N ratio of 5S dB.
- 15 -
Example 8
CH (CH3) 2
6~o - CHC (CH3) 3
N--~N~N
~N--TiO--N~
(Cl 13)3CCH- N ~N~f~sN -CHC (CH3)3
(CH3)2CH \ / CH(CH3)2
~30- CHC (CH3) 3
t~H (CH3) 2
~ An optical data storage card was prepared by
:, carrying out the same procedures as described in Example
1 except that phthalocyanine illustrated by the formula
and having a melting point of 260 'C, decomposition
initiating ~emperature of 272 C, Amax of 739 nm and
~max of 2.0 x 105 1 mol-~ cm-1 was used.
The optical data storage card thus obtained was
recorded at a linear velocity of 1.4 m/sec with a laser
of 7.5 mW in power and 830 nm in wavelength to obtain a
record ha~ing a C~N ratio of 61 dB.
7 3
- 16 -
Example 9
,~Br CH (CH3) 2
0 - CH--C (CH3)2
CH (CH3) 2 A ~2Hs
(CH3)2C--CH--O Nf~N/~N
C2Hs ~N--TiO--N~Q~Br C2Hs
N N N ~ CH--(~ (CH3)2
(CH3) 2CH ~~ ~H (CH3)
(CH3)2C--(~H--O~
C2Hs Br
An optical data storage card was prepared by
carrying out the same procedures as deæcribed in Example
1 except that phthalocyanine illustrated by the formula
and having a melting point o 255 C, a decomposition
initiating temperature of 267 C, ~max of 759 nm and
max of 1.9 x 105 l mol-l cm-l was used.
The optical data storage card thus obta~ined was
recorded at a linear velocity of 1.3 mJsec with a laser
o 7.5 mW in power and 830 nm in wavelength to obtain a
record having a C/N ratio of 60 dB.
~3~3~P~
- 17 -
Example 10
Br
~O-CH [C (CH3)3]2
[ (CH3) 3C] 2CH- O N N N
~N--TiO--N~
N ~,N~N O- CH [ C ( CH3)3] 2
[(CH3)3C]2CH- O~
An optical data storage card was prepared by
carrying out the same procedures aæ described in Example
1 except that phthalocyanine illustrated by the formula
and having a melting point of 260 C, a decomposition
initiating temperature of 280 'C, ~max of 732 nm and
~max of 2.1 x 10S l mol-l cm-1 was used.
The optical data storage card thus obtained was
recorded at a linear velocity of 1.4 m/sec with a laser
of 7 mW in power and 830 nm in wavelength to obtain a
record having a C/N ratio of 57 dB.
Comparative Test
The above obtained optical data storage cards of
the invention were compared their performance with opti-
cal data storage cards prepared by using known condi-
2~3~s~3
- 18 -
tions.
The optical data storage cards prepared in
examples 2, 4 and 5 were used as the cards of the inven-
tion. The cards prepared by using 6 known colorants
described below were used as comparative examples.
Comparative Example 1
The compound having the following formula was
used according to Japanese Laid-Open Patent 138382
(1990).
CH3~C 5 H~l
H~N--~:N~N~3
~N--VO--N~J
CH3 N~<,N~rN C s H,
H"Cs~CH3
Comparative Example 2
The colorant having the illustrated formula was
used according to Japanese Laid-Open Patent 24692 (198~1).
~CH=CHhCH ~J
CH3 Ie (~:H3
-- 19 --
Comparative Example 3
An optical data storage card was prepared by
using colorant, SPIRON BLACK MH SPECIA~ N, according to
Japanese Laid-Open Patent 130737 (1990).
Comparative Exampl0 4
An inorganic compound was used for recording
layer according to Japanese Laid-Open Patent 122438
(13gO).
Comparative Example 5
An optical data storage card was prepared by
carrying out the same procedures as described in Example
1 except that a colorant having the illustrated formula,
a melting point of 80 to 90 C and a decomposition initi-
ating temperature of 310-C was used.
CaHI7
N--~N~N
~N--Cu--N~
N <~N>~N
Hl7Ca
2 ~ 3
- 20 -
Comparative Example ~
An optical data storage card was prepared by
carrying out the same procedures as described in Example
1 except that a colorant having the illustrated formula,
a melting point of higher than 140-C and a decomposition
initiating temperature of 320 C was used.
PhS SPh
C9H,7- 0~0- C ~ H,7
PhS~N N N~7
PhS J~N--CU--N~ SPh (Ph = ~ )
C8H,7- O N <~N~N O- C 8 H,7
C8H,7- (}~0- C 8 H,7
PhS SPh
~ ' .
In tha above comparative examples, properties of
the media obtained were measured by the following meth- --
ods. Results were compared with those obtained by E~am-
ples and summarized in Table 1. Evaluation was made by
the follouing standards.
Reflectance ... measurad with a light beam having a
wavelength of 780 nm.
Sensitivity ... measured at a linear velocity of 1.4
mJsec and a wavelength of 780 nm.
~$~3
- 21 -
Symmetry ... measured at a recording power ranging
from 5 to 90 mW.
O ... less than 5~ fluctuation
x ... more than 5~ fluctuation
Pulse duration correction ...... Necessary correction
range was measured by writing 4T signal
(231 x 4 = 924 nsec).
O ... correction range: 0 to -100 nsec
... correction range: -lO0 to -200 nsec
x ... correction range: more than -200 nsec
Record distortion ... Distortion of recorded waveform
was measured with an oscilloscope.
Distortion of gold layer was examined by
observing recording pit under microsc~pe.
O ... no distortion
x ... dis~ortion found
Durability ... Measured by variation in record
stability of regenerated light) after reading
out lO' times at a linear velocity of 1.4 m/sec
with power of 0.5 mW and by variation of record
after a daylight exposure fastness acceleration
test with a xenon lamp at 40'C for 100 hours.
O ... Each variation is less than 10%.
... Each variation is from lO to 20%.
x ... Each variation is more than 20%.
~3~
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-- 23 --
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